Retrofitting a rain shower - tips requested

The drainage capacity is also important. If more comes from above, more must also drain away. We had to use a different drainage channel (but it was mainly due to the waterfall)

You really scare people.
You just want to update the comfort a bit, and now the cable cross-section and drainage capacity are involved

They come with an integrated thermostat or with a hose to connect to an external mixer.

Exactly that. With a hose, since an external mixer is already available. I have to google the company. A trip there takes just half an hour from us and we have another bathroom showroom very close to us. I didn't even think of the most obvious idea. Thanks to you.

Is it really the cable cross-section? I had previously retrofitted a (cheap) rain shower in my rental apartment - it was great and the cables certainly weren't specially planned that way!

Here you go. That sounds good. Our house is from 2013 (oh God, already that old), so the supply line should somehow work out. Yesterday we spontaneously bought an Ikea part, but it’s not tall enough. We will take a look at the Schulte. Thanks to you all for now.

The surface-mounted rain showers are often smaller than the concealed ones. Everything is normal with us and works.

The exposed rain showers are often smaller than the concealed ones.
For us, everything is normal and works.

The Raindance E 300 is out of the question because of the price.

Well, as I said, take a look at Schulte, they are good and inexpensive and come in various designs. IMHO exactly what you're looking for. They also hold up.